In this study, we confirmed whether positive affect have improvement effect on the burnout tendency through problem-focused coping in university student athletes. The participants were 206 male members from university athletic clubs. Firstly, based on previous studies, we established a hypothetical model using positive affect as an independent variable, problem-focused coping as a mediator, and burnout tendency as a dependent variable. Positive affect was evaluated by the PANAS Japanese version, problem-focused coping was evaluated by the Situational version of the General Coping Questionnaire, and burnout tendency was evaluated by the Athletic Burnout Inventory scale. Secondly, we used covariance structure analysis to examine the validity of this hypothetical model. Finally, we estimated whether positive affect have improvement effect on the burnout tendency. Results showed that 1) each of the fitness indices in the hypothetical model showed higher values (GFI=.975, AGFI=.923, CFI=.984, RMSEA=.074) which satisfied the adoption standard, thus demonstrating the validity of the hypothetical model, and that 2) positive affect was confirmed to have improvement effect both directly and indirectly on the burnout tendency.